It’s definitely a D In terms of general reception regardless of what I think about it
That's true, but parsing out the robust quality of Season 8 vs the reaction to it are, of course, very different things.
Maybe I'm naive, but I truly believe over time Season 8 will be remembered more for what it got right than what it got wrong. An excellent example is The Long Night. It looks like pure sex in high quality, but most people didn't experience it that way. That primed the backlash as much, or more, than any story-level problems. And what's more, anger over Bran's arc "not going anywhere" will vanish in hindsight.
Another is that the broad strokes of the ending--Jon, Tyrion, Arya, Sansa Dany, etc--perfectly suits their 10 year long character arcs.